I'm not sure if this video is legal, but here's a collection of clips of appearances by African-Americans on US television between 1949 and 1960, and possibly some unrelated stuff that probably shouldn't be in the video. I had a lot of trouble putting this together, I hope it turned out OK (Note: the "Amos 'n' Andy" clip comes from the "Stars in the Eye" TV special, and not from the show itself, which is still copyrighted)
September 5, 2013 Subject:
You have done a great public service
Terrific collection. I had no idea that many of these artists even existed. Very entertaining. Thanks to the creator/uploaded.
September 4, 2013 Subject:
Amos and Andy is public domain
Just to correct something, Amos and Andy TV is in the public domain and you can find clips all over the internet. CBS has not pursued any copyright claim for fear of giving the impression that they have an actual interest in the show.